APA (7th ed.) Citation

Baldus, C. (2009). Quelle: Ärger frei Haus. GPR, 6(2), .

Chicago Style (17th ed.) Citation

Baldus, Christian. "Quelle: Ärger Frei Haus." GPR 6, no. 2 (2009).

MLA (9th ed.) Citation

Baldus, Christian. "Quelle: Ärger Frei Haus." GPR, vol. 6, no. 2, 2009.

Warning: These citations may not always be 100% accurate.